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Volume 28 , Issue 3
May/June 2013

Pages e122e127

The Effect of Platform Switching on Stress in Peri-implant Bone in a Condition of Marginal Bone Resorption: A Three-Dimensional Finite Element Analysis

Haibin Xia, DDS, PhD/Min Wang, DDS, MS/Li Ma, MDS, PhD/Yi Zhou, DDS, PhD/Zhiyong Li, DDS, PhD/Yining Wang, DDS, PhD

PMID: 23748330
DOI: 10.11607/jomi.2965

Purpose: The aim of the present study was to investigate the stress distribution in the bone around a platformswitched implant with marginal bone loss. Materials and Methods: Finite element models of an implantsupported crown on a mandibular first molar were constructed and included an osseointegrated implant, a metal crown, and cancellous and cortical bone. Two kinds of abutments, conventional and platformswitched, were imported into the model. A variety of different levels of conical marginal bone resorption, from 0 to 2.0 mm in height and width, was created around the implant neck. The stresses generated in the peri-implant bone tissue were analyzed under 200 N of vertical or oblique loading. Results: The location of stress concentration extended from the implant neck toward the apex in association with increases in bone resorption depth. In the bone-resorbed models, the platform-switched implant showed lower maximum equivalent stresses in the peri-implant bone than the conventional abutment. The difference between the two implant models decreased as bone resorption increased. Conclusion: Within the limitations of this study, the results suggest a biomechanical advantage for platform switching in a condition of marginal bone resorption, but this advantage may be weakened when bone resorption is dramatic. Additional animal or clinical studies are necessary to better clarify the effects of peri-implant bone defects on the biomechanical features of a platform-switched configuration. Int J Oral Maxillofac Implants 2013;28:e122e127. doi: 10.11607/jomi.2965

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